i had an idea to make a bullpup nerf rival khaos... shell modification (with epoxy putty and all that) and... well its needless to say it looked much better in my head. :
My Rival Khaos Mod : r/Nerf
Amazon.com: Nerf Rival Khaos MXVI-4000 - Juguete blaster, color azul : Juguetes y Juegos